Power Amp transformer hum - intermittent and increases and decreases in a few seconds

Hi John,
If it's mechanical hum, then yes, there are a number of DC eliminators which should work for you.

If you live in a single family home, it may help more to try to eliminate the problem via the process of elimination. Turn off all the other breakers in the house first and see if the problem goes away. 
Best,

E

Blue Circle BC86 Power Pillow will not eliminate hum, I own two.
If you believe there is DC causing hum, then try the Emotiva. There is a trial period.

Is your amp tube or SS? Is the hum only isolated to the amp, or does it also play thru the speakers?

Thx E. I'll try the breaker solution after work.  

Thx lowrider.  Amp is SS and hums only thru transformer. Hum goes up in volume and then down in a cyclical type pattern.  

I had that problem once when I lived in a place with very poor power. It was DC getting into the line. I ended up just unplugging stuff when it happened and returning a hour or so later. It was annoying and aggravating. I tried gear to block it unsuccessfully. I was running a tube amp at the time.